release: 3.16.1 (#3899)

Automated Release PR
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##
[3.16.1](https://github.com/openai/openai-python/compare/v3.16.0...v3.16.1)
(2026-09-18)


### Bug Fixes

* **api:** avoid loading unrelated API resources on first use
([#3898](https://github.com/openai/openai-python/issues/3898))
([68e4317](https://github.com/openai/openai-python/commit/68e4317aa3df4b6e7a5ea3f75833bdd7d76e447d))

---
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